T. Kanesue

Brookhaven National Laboratory, New York, New York, United States

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Publications (56)51.88 Total impact

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    ABSTRACT: We investigated the high intensity plasma generated by using a Nd:YAG laser to apply a laser-produced plasma to the direct plasma injection scheme. The capability of the source to generate high charge state ions strongly depends on the power density of the laser irradiation. Therefore, we focused on using a higher power laser with several hundred picoseconds of pulse width. The iron target was irradiated with the pulsed laser, and the ion current of the laser-produced iron plasma was measured using a Faraday cup and the charge state distribution was investigated using an electrostatic ion analyzer. We found that higher charge state ironions (up to Fe21+) were obtained using a laser pulse of several hundred picoseconds in comparison to those obtained using a laser pulse of several nanoseconds (up to Fe19+). We also found that when the laser irradiation area was relatively large, the laser power was absorbed mainly by the contamination on the target surface.
    No preview · Article · Feb 2016 · Review of Scientific Instruments
  • M. Okamura · C. Stifler · K. Palm · D. Steski · S. Ikeda · M. Kumaki · T. Kanesue
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    ABSTRACT: We studied proton beam production from a laser ion source using hydrogen rich target materials. In general, gas based species are not suitable for laser ion sources since formation of a dense laser target is difficult. In order to achieve reliable operation, we tested hydride targets using a sub nanosecond Q-switched Nd-YAG laser, which may help suppress target material consumption. We detected enough yields of protons from a titanium hydride target without degradation of beam current during the experiment. The combination of a sub nanosecond laser and compressed hydride target may provide stable proton beam.
    No preview · Article · Feb 2016 · Review of Scientific Instruments
  • S. Ikeda · M. Kumaki · T. Kanesue · M. Okamura
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    ABSTRACT: In the laser ion source (LIS) at the Brookhaven National Laboratory (BNL), a solenoid is used to guide the laser ablation plasma and modulate the extracted beam current. Many types of ion species are guided. In some cases, the plasma plume is injected into the solenoid away from the solenoidal axis. To investigate the effects of the solenoid on the beam extracted from the plasma that has different properties, the beam current was measured in the setup of the LIS at the BNL. The beam current of Li, Al, Si, Fe, and Au increased when the magnetic field was applied. For most of the species the peak current and the total charge within a single beam pulse increased around 10 times with a magnetic field less than 100 G. In addition, for some species the rate of increase of the peak currents became smaller when the magnetic flux densities were larger than certain values depending on the species. In this case, the current waveforms were distorted. At the same magnetic field value, the field was more effective on lighter species than on heavier ones. When plasma was injected offset from the axis of the solenoid, peak current and total charge became half of those without offset. The experimental data are useful for the operation of the LIS at the BNL.
    No preview · Article · Feb 2016 · Review of Scientific Instruments
  • T. Kanesue · M. Kumaki · S. Ikeda · M. Okamura

    No preview · Article · Feb 2016 · Review of Scientific Instruments
  • M. Okamura · K. Palm · C. Stifler · D. Steski · S. Ikeda · M. Kumaki · T. Kanesue
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    ABSTRACT: Calcium and lithium ion beams are required by NASA Space Radiation Laboratory at Brookhaven National Laboratory to simulate the effects of cosmic radiation. To identify the difficulties in providing such highly reactive materials as laser targets, both species were experimentally tested. Plate shaped lithium and calcium targets were fabricated to create ablation plasmas with a 6 ns 1064 nm neodymium-doped yttrium aluminum garnet laser. We found significant oxygen contamination in both the Ca and Li high charge state beams due to the rapid oxidation of the surfaces. A large spot size, low power density laser was used to create low charge state beams without scanning the targets. The low charge state Ca beam did not have any apparent oxygen contamination, showing the potential to clean the target entirely of oxide with a low power beam once in the chamber. The Li target was clearly still oxidizing in the chamber after each low power shot. To measure the rate of oxidation, we shot the low power laser at the target repeatedly at 10 s, 30 s, 60 s, and 120 s interval lengths, showing a linear relation between the interval time and the amount of oxygen in the beam.
    No preview · Article · Feb 2016 · Review of Scientific Instruments
  • T. Kanesue · M. Kumaki · S. Ikeda · M. Okamura
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    ABSTRACT: We have investigated laser ablationplasma of various species using nanosecond and sub-nanosecond lasers for both high and low charge state ion productions. We found that with sub-nanosecond laser, the generated plasma has a long tail which has low charge state ions determined by an electrostatic ion analyzer even under the laser irradiation condition for highly charged ion production. This can be caused by insufficient laser absorption in plasma plume. This property might be suitable for low charge state ion production. We used a nanosecond laser and a sub-nanosecond laser for low charge state ion production to investigate the difference of generated plasma using the Zirconium target.
    No preview · Article · Feb 2016 · Review of Scientific Instruments
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    ABSTRACT: To realize a heavy-ion inertial fusion (HIF) driver, we have studied a possibility of laser ion source (LIS). A LIS can provide high-current high-brightness heavy-ion beams; however, it was difficult to manipulate the beam parameters. To overcome the issue, we employed a pulsed solenoid in the plasma drift section and investigated the effect of the solenoid field on singly charged iron beams. The rapid ramping magnetic field could enhance limited time slice of the current and simultaneously the beam emittance changed accordingly. This approach may also be useful to realize an ion source for HIF power plant.
    No preview · Article · Jun 2015 · Laser and Particle Beams
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    ABSTRACT: A Laser ion source (LIS) provides high current heavy ion beams with a very simple mechanical structure. Plasma is produced by a pulsed laser ablation of a solid state target and ions are extracted by an electric field. However, it was difficult to manipulate the beam parameters of a LIS, since the plasma condition could only be adjusted by the laser irradiation condition. To enhance flexibility of LIS operation, we employed a pulsed solenoid in the plasma drift section and investigated the effect of the solenoid field on singly charged iron beams. The experimentally obtained current profile was satisfactorily controlled by the pulsed magnetic field. This approach may also be useful to reduce beam emittance of a LIS.
    No preview · Article · May 2015 · Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
  • Takeshi Kanesue · Masahiro Okamura
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    ABSTRACT: In Brookhaven National Laboratory (BNL), we have been developing laser ion sources for diverse accelerators. Tabletop Nd:YAG lasers with up to several Joules of energy are mainly used to create ablation plasmas for stable operations. The obtained charge states depend on laser power density and target species. Two types of ion extraction schemes, direct plasma injection scheme (DPIS) and conventional static extraction, are used depending on the application. We optimized and selected a suitable laser irradiation condition and a beam extraction scheme to meet the requirement of the following accelerator system. We have demonstrated to accelerate more than 5 × 1010 of C6+ ions using the DPIS. We successfully commissioned a low-charge ion beam provider to the user facilities in BNL. To achieve higher current, higher charge state and lower emittance, further studies will continue.
    No preview · Article · Apr 2015 · Radiation Effects and Defects in Solids
  • Takeshi Kanesue · Yasuhiro Fuwa · Kotaro Kondo · Masahiro Okamura
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    ABSTRACT: Pulse length extension of highly charged ion beam generated from a laser ion source is experimentally demonstrated. The laser ion source (LIS) has been recognized as one of the most powerful heavy ion source. However, it was difficult to provide long pulse beams. By applying a solenoid field (90 mT, 1 m) at plasma drifting section, a pulse length of carbon ion beam reached 3.2 μs which was 4.4 times longer than the width from a conventional LIS. The particle number of carbon ions accelerated by a radio frequency quadrupole linear accelerator was 1.2 × 1011, which was provided by a single 1 J Nd-YAG laser shot. A laser ion source with solenoid field could be used in a next generation heavy ion accelerator.
    No preview · Article · Nov 2014 · Applied Physics Letters
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    ABSTRACT: The LION source is a new laser ion source (LIS), which was installed and commissioned at Brookhaven National Laboratory (BNL) for low charge state heavy ion production as an external source of primary ions for RHIC-EBIS. This is the first LIS for low charge state ion production to be combined with an Electron Beam Ion Source type heavy ion source for long term user operation. After short term of commissioning, the LION started to provide various ion species for NASA Space Radiation Laboratory (NSRL) since March, 2014, and Gold beam has been provided for RHIC since June, 2014.
    No preview · Article · Jul 2014
  • S. Ikeda · M. Kumaki · Y. Fuwa · T. Kanesue · M. Okamura · K. Horioka
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    ABSTRACT: In a typical configuration of a laser ion source, the plasma flux into an extraction electrode changes transiently. We try to make the constant plasma flux within a pulse with use of a pulsed magnetic field. Here to estimate the optimal magnetic field, we investigated the effect of the steady magnetic field generated by a coil on the plasma experimentally. We observed the plasma flux enhancement and the dependency of the enhancement on the longitudinal velocity of the ions and the magnetic flux density. The dependency indicates the magnetic field acts like a solenoid lens. We may predict the plasma flux enhancement by calculation of the orbit of a virtual charged particle whose mass is between those of the ion and electron.
    No preview · Article · Jul 2014
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    Full-text · Dataset · Apr 2014
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    ABSTRACT: To investigate efficient graphite material for carbon ion production in laser ion source, the plasma properties produced from these materials are measured. Comparing acquired current profile and charge state distribution, the distributions of ions in laser induced plasma from isotropic graphite and single crystal of graphite are different. The produced quantity of C(6+) from isotropic materials is larger than that from single crystal.
    No preview · Article · Feb 2014 · The Review of scientific instruments
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    ABSTRACT: Multiple laser shots could be used to elongate an ion beam pulse width or to intensify beam current from laser ion sources. In order to confirm the feasibility of the multiple shot scheme, we investigated the properties of plasmas produced by double laser shots. We found that when the interval of the laser shots is shorter than 10 μs, the ion current profile had a prominent peak, which is not observed in single laser experiments. The height of this peak was up to five times larger than that of single laser experiment.
    No preview · Article · Feb 2014 · The Review of scientific instruments
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    ABSTRACT: A magnetic field can increase an ion current of a laser ablation plasma and is expected to control the change of the plasma ion current. However, the magnetic field can also make some fluctuations of the plasma and the effect on the beam emittance and the emission surface is not clear. To investigate the effect of a magnetic field, we extracted the ion beams under three conditions where without magnetic field, with magnetic field, and without magnetic field with higher laser energy to measure the beam distribution in phase space. Then we compared the relations between the plasma ion current density into the extraction gap and the Twiss parameters with each condition. We observed the effect of the magnetic field on the emission surface.
    No preview · Article · Feb 2014 · The Review of scientific instruments
  • M Okamura · T Kanesue · T Yamamoto · Y Fuwa
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    ABSTRACT: A new set of vanes of radio frequency quadrupole (RFQ) accelerator was commissioned using highly charged iron beam. To supply high intensity heavy ion beams to the RFQ, direct plasma injection scheme (DPIS) with a confinement solenoid was adopted. One of the difficulties to utilize the combination of DPIS and a solenoid field is a complexity of electro magnetic field at the beam extraction region, since biasing high static electric field for ion extraction, RFQ focusing field, and the solenoid magnetic field fill the same space simultaneously. To mitigate the complexity, a newly designed magnetic field clamps were used. The intense iron beam was observed with bunched structure and the total accelerated current reached 2.5 nC.
    No preview · Article · Feb 2014 · The Review of scientific instruments
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    ABSTRACT: In Brookhaven National Laboratory, laser ion source has been developed to provide heavy ion beams by using plasma generation with 1064 nm Nd:YAG laser irradiation onto solid targets. The laser energy is transferred to the target material and creates a crater on the surface. However, only the partial material can be turned into plasma state and the other portion is considered to be just vaporized. Since heat propagation in the target material requires more than typical laser irradiation period, which is typically several ns, only the certain depth of the layers may contribute to form the plasma. As a result, the depth is more than 500 nm because the base material Al ions were detected. On the other hand, the result of comparing each carbon thickness case suggests that the surface carbon layer is not contributed to generate plasma.
    No preview · Article · Feb 2014 · The Review of scientific instruments
  • M Sekine · S Ikeda · N Hayashizaki · T Kanesue · M Okamura
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    ABSTRACT: Extracted ion beams from the test laser ion source (LIS) were transported through a test beam transport line which is almost identical to the actual primary beam transport in the current electron beam ion source apparatus. The tested species were C, Al, Si, Cr, Fe, Cu, Ag, Ta, and Au. The all measured beam currents fulfilled the requirements. However, in the case of light mass ions, the recorded emittance shapes have larger aberrations and the RMS values are higher than 0.06 π mm mrad, which is the design goal. Since we have margin to enhance the beam current, if we then allow some beam losses at the injection point, the number of the single charged ions within the acceptance can be supplied. For heaver ions like Ag, Ta, and Au, the LIS showed very good performance.
    No preview · Article · Feb 2014 · The Review of scientific instruments
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    ABSTRACT: To create mixed species ion beam with laser pulses, we investigated charge state distributions of plasma formed from both Al-Fe alloy targets and pure Al and Fe targets placed close together. With two targets, we observed that the two kinds of atoms were mixed when the interval of two laser pulses was large enough (40 μs). On the other hand, when the interval was 0.0 μs, we observed fewer Fe ions and they did not mix well with the Al ions. The two species were mixed well in the plasma from the alloy target. Furthermore, we observed that specific charge states of Fe ions increased. From the results, it was determined that we can use two pure targets to mix two species whose difference of the drift velocity is large. On the other hand, we must use an alloy target when the drift velocities of the species are close.
    No preview · Article · Feb 2014 · The Review of scientific instruments

Publication Stats

92 Citations
51.88 Total Impact Points

Institutions

  • 2014-2015
    • Brookhaven National Laboratory
      New York, New York, United States
    • Goethe-Universität Frankfurt am Main
      • Institute of Applied Physics
      Frankfurt, Hesse, Germany
  • 2006-2010
    • RIKEN
      • Radiation Laboratory
      Вако, Saitama, Japan
    • Kyushu University
      • Department of Applied Quantum Physics and Nuclear Engineering
      Hukuoka, Fukuoka, Japan
  • 2
    • Japan Atomic Energy Agency
      Muramatsu, Niigata, Japan